Median averaging of electromyographic motor unit action potentials: comparison with other techniques |
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Authors: | S D Nandedkar D B Sanders |
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Institution: | (1) Division of Neurology, Duka University Medical Center, Box 3403, 27710 Durham, NC, USA |
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Abstract: | A technique of extracting individual motor unit action potentials (MUAPs) from EMG signals by median averaging, a modification
of an existing method, is presented. To compare different techniques of MUAP extraction, 89 MUAPs were recorded with a concentric
needle electrode in the brachial biceps muscle of normal subjects and patients with nerve and muscle diseases. MUAPs were
also extracted by another method, called split-sweep median averaging, in which alternate MUAP discharges are averaged independently
in two computer buffers until the two averaged signals appear equal on visual inspection by the operator. The amplitude, area,
area: amplitude ratio, duration and number of phases and turns of each extracted MUAP were determined by each technique. Overall,
there was a strong correlation between all features of the MUAPs extracted by median and splitsweep averaging, although the
latter method required, on average, twice as many MUAP discharges to produce acceptable signals. We thus conclude that median
averaging is a fast and accurate method that requires relatively few MU discharges to extract MUAP signals from spurious background
signals. |
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Keywords: | Averaging Computer-aided EMG Motor unit action potentials Template matching |
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